Search Results
Results 551 - 600 of 1378
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Yang Zhen - - 2002
To investigate the pathological morphology alteration of the splanchnic vascular wall in portal hypertensive patients. Splenic arteries, veins and gastric coronary veins from portal hypertensive patients (n = 50) were removed during esophagogastric devascularization with splenectomy and were observed under optic and electron microscopes. The expression of iNOS in the ...
Hino Shoryoku - - 2002
BACKGROUND: An understanding of the development of esophageal varices is important in the evaluation of risk of variceal hemorrhage. To clarify factors affecting the development of esophageal varices, the morphology and hemodynamics of the left gastric vein were analyzed with color Doppler EUS. METHODS: Sixty-seven patients with esophageal varices underwent ...
Alexander Barry - - 2002
Intrahepatic shunts have an important function in the regulation of portal venous pressure in the normal rat liver. The present study determined their location, the region of confluence between the hepatic arterial and portal venous vasculatures, regions within the liver that are bypassed and the effects of hepatic arterial perfusion ...
Sobhonslidsuk Abhasnee - - 2002
Portal vein thrombosis (PVT) is an uncommon cause for presinusoidal portal hypertension. Although several predisposing conditions are known to exist in the background of PVT, there still remains a proportion of patients in whom the etiology is not known and the pathogenesis is unclear. In this review we summarize the ...
Krajina Antonin - - 2002
PURPOSE: Carbon dioxide (CO2) can traverse the hepatic sinusoids better than iodinated contrast medium and has been used by many interventionalists for wedged hepatic venography during transjugular intrahepatic portosystemic shunt (TIPS) procedures. Our study was designed to compare the extent of the portal vein opacification using either CO2 or iodinated ...
Lau H - - 2002
Portal vein aneurysm is a rare clinical entity with only 42 published cases in the English literature. We present a 30-yr old woman who was incidentally diagnosed with an extrahepatic portal vein aneurysm during the investigation for dyspepsia. Expectant management with regular follow-up and surveillance imaging was adopted. This pathology ...
Arakawa Masahiro - - 2002
In this article, the gross pathology of varices and supplying veins are described comparing esophageal varices and varices of the cardia and fundus of the stomach. The angioarchitecture of the lower esophagus is such that normally very thin parallel veins in the lamina propria mucosae in the palisade zone become ...
Fernandes T R L - - 2002
AIMS/BACKGROUND: Cellular and extracellular volume changes caused by ATP were investigated in the liver as well as the possible formation of diffusion barriers, which could be responsible for some of its metabolic effects. METHODS: The experimental system was the bivascularly perfused rat liver. [(14)C]Sucrose and [(3)H]water were simultaneously injected into ...
Gallego Carmen - - 2002
Knowledge of the normal anatomy, most frequent variants, and congenital and acquired anomalies of the portal venous system is of great importance for liver surgery and interventional procedures such as creation of transjugular intrahepatic portosystemic shunts. Radiologic studies of the portal venous system include color Doppler ultrasonography (US), computed tomography ...
Neri Sergio - - 2002
Laser therapy has gained wide acceptance and application in many medical disciplines. Side effects of laser therapy are rare and the most frequent mainly involve the skin. We describe a patient affected by familial adenomatous polyposis that had been repeatedly controlled and treated endoscopically using an Nd:Yag laser. He presented ...
Furuya Yoshitaka - - 2002
A case of transient portal venous gas in the liver following blunt abdominal trauma is described. Computed tomography (CT) demonstrated hepatic portal venous gas 4 h after the injury. An exploratory laparotomy revealed segmental necrosis of the small intestine with a rupture of the bladder. Pneumatosis intestinalis was evident on ...
Katoh T - - 2002
BACKGROUND: We examined the factors of delayed enhancement of hepatocellular carcinoma (HCC) on dynamic computed tomography (CT). METHODS: Dynamic CT and angiography were compared in 113 patients who had undergone transcatheter arterial chemoembolization or transcatheter arterial chemoinfusion and were suspected of developing new HCCs. RESULTS: Eight of 113 patients had ...
Kaneko Tetsuya - - 2002
AIM: To investigate the diagnostic accuracy of power Doppler ultrasonography (US) in assessing the vascular invasion by pancreatic cancer. METHODS: A prospective study of 40 consecutive patients with pancreatic cancer (head 35, body 5) was performed. All patients underwent surgery. The relationships between tumor and each vessel were classified into ...
Kimura Masashi - - 2002
BACKGROUND: The purpose of this study was to compare a very-high-flow injection-rate method (group A) and a conventional injection-rate method (group B) for visualization of upper abdominal arteries by multidetector helical computed tomography (MDHCT). METHODS: The subjects were 240 patients suspected to have abdominal lesions. They were randomly assigned to ...
Mansueto Giancarlo - - 2002
BACKGROUND/AIMS: To report a case of bleeding after pancreatoduodenectomy in a patient with pancreatic leak and portal thrombosis who was successfully treated with an endovascular approach. METHODS: A 58-year-old male, suffering from neoplasm of the distal bile duct, underwent a pylorus-preserving Whipple procedure. On the 18th day, following a sudden ...
Takayama Y - - 2001
Diagnostic imaging and embolization therapy for very rare intrahepatic portal-systemic shunts with liver cirrhosis are reported. An 82-year-old woman was admitted to the hospital (Yachiyo Hospital) because of hepatic encephalopathy. Computed tomography with contrast enhancement demonstrated anomalous vessels between the portal vein and the inferior vena cava. Those shunts were ...
Sok J - - 2001
Portal vein thrombosis is a rare but well-recognized complication of splenectomy. We present the case of a 31-year-old woman with transfusion-dependent b-thalassemia who underwent a laparoscopic splenectomy to reduce her transfusion requirements. Postoperatively, she developed portal vein thrombosis, diagnosed by abdominal CT scanning on postoperative day 4. After being treated ...
Buckman R F - - 2001
Wounds of the portal vein are caused most commonly by penetrating trauma and carry a very high mortality rate. Most deaths are caused by exsanguination, occurring intraoperatively as surgeons struggle to control the hemorrhage from the portal vein and associated vascular injuries. A thorough knowledge of the anatomy of the ...
Sugawara Yasuhiko - - 2002
The factors that contribute to the effect of portal vein embolization before hepatectomy for hepatocellular carcinoma are unclear. Sixty-six patients with hepatocellular carcinoma were enrolled in the study. Changes in liver function, portal vein pressure, and liver volume after embolization were examined. A multiple linear regression analysis was performed to ...
Baccarani U - - 2001
BACKGROUND: Early portal vein thrombosis is a rare but severe complication of liver transplantation requiring retransplantation or at least surgical thrombectomy, both hampered by high morbidity and mortality. METHODS: We describe of a case of successful long-term recanalization of early posttransplantation portal vein thrombosis by a minimally invasive percutaneous transhepatic ...
Alexander B - - 2001
Intrahepatic shunts regulate portal venous pressure during periods of acute portal hypertension when the transhepatic portal resistance is momentarily increased in the normal rat liver in vivo. Hepatic arterial inflow may also increase the transhepatic portal resistance and activate intrahepatic shunts. In the present study, the transhepatic portal resistance and ...
Kobayashi S - - 2001
Arterio-portal shunts are generally treated with transcatheter arterial embolization, as a therapeutic measure for bleeding of esophageal varices. However, transcatheter arterial embolization is frequently associated with reestablishment of arterio-portal shunts. We now report our experience with partial hepatectomy to remove the arterio-portal shunt associated with esophageal varices, which recurred after ...
Patan S - - 2001
To investigate mechanisms of vascular morphogenesis in tissue repair, we performed ovariectomy with resection of the corresponding branches of the ovarian vessels in nude mice. This induces a vascular network remodeling response in the healing ovarian pedicle. Reconstruction of 2000 histological serial sections demonstrated that a new vascular network composed ...
Cheynel N - - 2001
The authors report a rare anomaly of portal vascularization which was detected by CT-scan and MRI and then confirmed surgically. There was no portal bifurcation at the hilum of the liver. After giving off its right dorsal branch, the portal vein entered the right liver and divided in the parenchyma ...
Machado M C - - 2001
BACKGROUND/AIMS: One of the determining factors for the unresectability of pancreatic head tumors is the involvement of the portal venous system. Recent reports show that the resection of tumors with portal vein involvement has similar results to lesions with same stage without portal vein invasion. The aim of this study ...
Otake M - - 2001
We report here a case of an unusual extrahepatic portosystemic venous shunt in a 37-year-old woman without liver cirrhosis or portal hypertension, who developed portal systemic encephalopathy. Angiography demonstrated an inferior mesenteric-caval shunt characterized by the presence of direct communication of the inferior mesenteric vein with the left internal iliac ...
Aytekin C - - 2001
A case of portal vein thrombosis (PVT) secondary to pancreatitis is presented. Patient was treated with catheter-directed thrombolysis using urokinase solution. Because the percutaneous transhepatic approach is associated with higher risk of hemorrhage we used the catheter-directed thrombolysis via the transjugular intrahepatic access to restore the patency of the thrombosed ...
Cappadonna C R - - 2001
BACKGROUND: Portal venous and hepatic arterial reconstruction are critical to successful outcomes in orthotopic liver transplantation (OLT). With portal vein thrombosis or inadequate hepatic arterial inflow, extra-anatomic vascular reconstruction is required. However, the clinical outcomes following extra-anatomic vascular reconstruction are largely unknown. METHODS: To determine the outcomes associated with extra-anatomic ...
Yamakado K - - 2001
PURPOSE: To evaluate the clinical usefulness of portal venous stent placement in patients with pancreatic or biliary neoplasms invading portal veins and causing portal hypertension. MATERIALS AND METHODS: Thirteen patients underwent portal venous stent placement because of gastrointestinal bleeding (n = 8), risk of gastroesophageal varix rupture (n = 4), ...
Piscaglia F - - 2001
The accuracy of various Doppler parameters of portal circulation in the diagnosis of relevant portal hypertension (presence of gastroesophageal varices) was prospectively validated. The following parameters were compared in 51 patients with chronic liver disease (40 with cirrhosis and 11 with chronic hepatitis): portal vein flow velocity and congestion index, ...
Gayer G - - 2001
Paroxysmal nocturnal hemoglobinuria is a rare disorder characterized by pancytopenia. One of the main manifestations of this disease is development of widespread life-threatening venous thrombosis, which may involve multiple abdominal veins. We describe two patients with paroxysmal nocturnal hemoglobinuria with clinically unsuspected portal, splenic, and mesenteric venous thromboses that were ...
Brown K T - - 2001
Preoperative portal vein embolization has been used as method of inducing compensatory hypertrophy in the future remnant liver since it was first described in the late 1980s. Many different vascular embolic agents have been successfully used for this procedure, and there is no general consensus regarding which is the best ...
Kaneko T - - 2001
BACKGROUND/AIMS: Pancreatic cancer easily invades retroperitoneal tissue, especially the portal vein and extrapancreatic nerve plexus. We evaluated the diagnostic accuracy of intraportal endovascular ultrasonography in portal vein and extrapancreatic nerve plexus invasion. METHODOLOGY: Intraportal endovascular ultrasonography was performed in 78 cases of pancreatic cancer (head 67, body 8, total 3). ...
Kamikawa S - - 2001
Profound intraventricular hemorrhage (IVH) has devastating effects on neonates, leading to significant neurodevelopmental morbidity. We have developed a flexible fiberoptic ventriculoscope (Yamadori-type 8), which has a conspicuously high resolving power and is equipped with a bipolar coagulator and a working channel for irrigation. Four neonates with IVH were examined and ...
Antoch G - - 2001
A major complication of portal and mesenteric vein thrombosis is acute bowel ischaemia resulting in infarction and requiring immediate resection of the involved segment. Sufficient collaterals can prevent acute haemorrhagic infarction, but bowel stenosis due to chronic ischaemia may develop. We report two cases of ischaemic jejunal stenosis occurring 4 ...
Kim J H - - 2001
PURPOSE: To establish, by means of serial ultrasonography (US), the incidence and natural history of neonatal portal venous thrombosis associated with catheterization of the umbilical vein and to evaluate the potential risk factors predisposing patients to thrombus formation. MATERIALS AND METHODS: Neonates who had undergone umbilical vein catheterization were studied. ...
Ohtsubo K - - 2001
An 82-year-old woman complaining of abdominal pain and vomiting was admitted to our emergency department. Abdominal X-ray, ultrasonography, and computed tomography showed hepatic portal venous gas, as well as pneumatosis intestinalis. We first suspected superior mesenteric arterial thrombosis. However, her physical findings, including computed tomography scanning and laboratory data, did ...
Piorko D - - 2001
OBJECTIVE: to compare anastomotic compliance in end-to-side anastomoses with and without vein cuff interposition. Materials polytetrafluoroethylene graft to bovine carotid artery without (standard) and with vein interposition (Linton-patch and Miller-cuff). METHODS: zonewise compliance measurement of end-to-side anastomoses in an in-vitro circulation system. The zone most distal to the suture-line served ...
Nakayama Y - - 2001
PURPOSE: The purpose of this study was to correlate thin-slice high-resolution helical CT findings of arterial and venous involvement in pancreatic cancers with surgical and histopathologic results. METHOD: Forty-eight patients with pancreatic cancer underwent preoperative thin-slice high-resolution helical CT, followed by surgical dissection of the pancreatic vessels during curative or ...
Hagimoto T - - 2001
Portal vein thrombosis is a rare complication in ulcerative colitis. We present a patient with portal vein thrombosis in ulcerative colitis who was successfully treated with colectomy. A 38-year-old Japanese female was admitted to our hospital because of an exacerbation of colitis. Abdominal ultrasonography performed because of liver dysfunction showed ...
Petersen B - - 2001
PURPOSE: To determine the feasibility of the creation of a direct intrahepatic inferior vena cava (IVC)-to-portal-vein shunt with puncture guided by a transfemorally placed intravascular ultrasound (IVUS) probe and use of a polytetrafluoroethylene (PTFE)-covered stent-graft. MATERIALS AND METHODS: In five swine, transjugular access was used to perform a direct puncture ...
Kobayashi S - - 2001
A case of a pseudolesion in segment IV of the liver, adjacent to the falciform ligament, was observed on conventional CT and CT during arterial portography. The pseudolesion was caused by drainage of the paraumbilical vein. Power Doppler ultrasound was helpful in recognizing this pseudolesion by depicting that the paraumbilical ...
Ferko A - - 2001
BACKGROUND/AIMS: Prehepatic portal hypertension caused by extrahepatic portal vein occlusion is a situation in which hepatocytes are not damaged by disease despite the fact that portal blood is unable to reach them due to portal vein occlusion. We explored the patency of intrahepatic portal vein branches after extrahepatic portal vein ...
Choi D - - 2001
PURPOSE: The purpose of this study was to ascertain the cause of opacification of the portal veins during CT hepatic arteriography (CTHA). METHOD: A total of 155 consecutive patients with hepatocellular carcinoma were evaluated with CTHA as preoperative staging. The opacification of the portal veins during CTHA was categorized as ...
Kito Y - - 2001
We report two different types of portal vein obstruction after liver resection: portal vein thrombosis due to steal phenomenon via a splenorenal shunt, and kinking of the skeletonized left portal vein after right hepatic lobectomy with caudate lobectomy. The two cases of portal vein obstruction were asymptomatic without any suggestive ...
Schaeffer I G - - 2001
An 18-month-old male Labrador retriever was referred for investigation of chronic intermittent diarrhoea and vomiting of two months duration. A diagnosis of hepatic arteriovenous fistulae was made. These are extremely rare hepatic vascular anomalies which confer arterial pressure to the portal vein. Liver atrophy, portal vein hypoplasia, portal hypertension and ...
Boeve W J - - 2001
The objective of this study to determine a suitable scan timing scheme in contrast enhanced MRA for the depiction of the arterial, the portal and the systemic venous system in the abdomen with maximum signal intensity in healthy subjects and in patients with cirrhosis. The signal intensity in the aorta, ...
Hegab A M - - 2001
Bleeding esophageal varices, one of the most feared complications of portal hypertension, contribute to the estimated 32,000 deaths annually attributed to cirrhosis. Successful control requires knowledge of the pertinent anatomy, underlying pathophysiology of portal hypertension, and natural history of gastro-esophageal varices. Drs Hegab and Luketic review these topics and discuss ...
Lau G - - 2001
A 93-year-old lady with dementia, neurological dysphagia and aspiration pneumonia, died from massive retroperitoneal haemorrhage which developed as a rare and, it is believed, hitherto unreported, complication of percutaneous endoscopic gastrostomy (PEG), which was performed for feeding purposes. It is postulated that the initial, unsuccessful attempt at needle puncture of ...
Denys A L - - 2001
The aim of this study was to assess the effect of vascular occlusion on radio-frequency (RF) lesion size and on potential associated biliary and portal lesions. Radio-frequency lesions using a 1-cm exposed-tip cooled electrode were created in pig liver. Liver perfusion was modified by arterial embolization (n=2), left portal clamping ...
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